CN217639777U - Virtual reality display device - Google Patents
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- CN217639777U CN217639777U CN202221925565.7U CN202221925565U CN217639777U CN 217639777 U CN217639777 U CN 217639777U CN 202221925565 U CN202221925565 U CN 202221925565U CN 217639777 U CN217639777 U CN 217639777U
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- 229910001935 vanadium oxide Inorganic materials 0.000 claims description 27
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- 238000005265 energy consumption Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
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- 239000004065 semiconductor Substances 0.000 description 2
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- MRPWWVMHWSDJEH-UHFFFAOYSA-N antimony telluride Chemical compound [SbH3+3].[SbH3+3].[TeH2-2].[TeH2-2].[TeH2-2] MRPWWVMHWSDJEH-UHFFFAOYSA-N 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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Abstract
The utility model provides a virtual reality display device, include: the display screen comprises a main display screen, an auxiliary display screen, a first super lens array and a projection lens; the resolution ratio of the auxiliary display screen is greater than that of the main display screen; the first super lens array is positioned on the light-emitting side of the main display screen and is positioned between the main display screen and the projection lens; a part of the first superlens units in the first superlens array can transmit light rays, and the other part of the first superlens units can reflect light rays. Through the embodiment of the utility model provides a virtual reality display device can be with the formation of image light that main display screen and auxiliary display screen sent to projection lens in the lump, forms partial high resolution, partial low resolution's the image that fuses to sight focus department at people's eye forms the image of high resolution, thereby can present high-quality image to the user. And, have frivolous characteristics, can reduce volume and weight, conveniently realize the lightweight.
Description
Technical Field
The utility model relates to a virtual reality technical field particularly, relates to a virtual reality display device.
Background
At present, virtual Reality (VR) projects an image to the eyes of a user, and a simulated environment is generated by using computer technology, so that the user can interact with the environment and feel immersive. VR devices generally seek larger field angles and high definition resolution displays, but most VR products do not compromise between the two. The display quality is improved and the energy consumption is considered while the field angle is large, so that the realization is difficult, and the problem which is solved by many manufacturers is solved.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an object of the embodiment of the present invention is to provide a virtual reality display device.
An embodiment of the utility model provides a virtual reality display device, include: the display screen comprises a main display screen, an auxiliary display screen, a first super lens array and a projection lens; the first super lens array comprises a plurality of first super lens units arranged in an array, and the resolution of the auxiliary display screen is greater than that of the main display screen;
the first super lens array is positioned on the light-emitting side of the main display screen and positioned between the main display screen and the projection lens; a part of the first superlens units in the first superlens array can transmit light rays, and the other part of the first superlens units can reflect light rays;
the main display screen is used for emitting first imaging light; the first super lens unit capable of transmitting light rays is used for transmitting the first imaging light rays to the projection lens;
the auxiliary display screen is positioned on one side, close to the projection lens, of the first super lens array and used for emitting second imaging light rays; the first super lens unit capable of reflecting light rays is used for reflecting the second imaging light rays to the projection lens;
the projection lens is configured to converge the first and second imaging light rays to generate a fused image.
In one possible implementation, the first superlens unit includes: a first excitation element and a vanadium oxide layer;
the first excitation element is used for applying a first excitation to the vanadium oxide layer; the vanadium oxide layer can change a phase change state under the action of the first excitation, so that the first super lens unit can switch between light capable of being transmitted and light capable of being reflected.
In one possible implementation, the first excitation element includes: a first electrode layer, a second electrode layer and a heating resistor; the first superlens unit further includes: at least one first nanostructure;
the heating resistor is positioned between the first electrode layer and the second electrode layer and is abutted against the first electrode layer and the second electrode layer; the first electrode layer and the second electrode layer are used for applying a first voltage to the heating resistor, and the heating resistor is used for changing the temperature of the vanadium oxide layer under the action of the first voltage;
the first nanostructure is located on one side of the second electrode layer away from the first electrode layer.
In one possible implementation, the first nanostructure is made of a phase change material;
the first excitation element is further for applying a second excitation to the first nanostructure; the first nanostructure can change a phase change state under the action of the second excitation, so that the first superlens unit changes the modulation effect on incident light.
In one possible implementation, the first excitation element further includes: a third electrode layer;
the first nanostructure is located between and abutting the second electrode layer and the third electrode layer; the second electrode layer and the third electrode layer are for applying a second voltage to the first nanostructure.
In one possible implementation, the virtual reality display apparatus further includes: an eye tracking system;
the eyeball tracking system is located on the side of the projection lens and faces the exit pupil position of the projection lens.
In one possible implementation, the virtual reality display apparatus further includes: a second superlens array; the second super lens array comprises a plurality of second super lens units arranged in an array; the second superlens unit is an adjustable superlens;
the second super lens array is used for modulating the second imaging light rays before the second imaging light rays are emitted to the projection lens so as to adjust the direction of the second imaging light rays.
In one possible implementation, the second superlens unit includes: a second excitation element and a phase change element made of a phase change material;
the second actuation element is to apply a third actuation to the phase change element; the phase change element can change a phase change state under the action of the third excitation so that the second super lens unit changes the modulation effect on incident light.
In one possible implementation, the third excitation is also used to adjust the focal length of the second superlens unit.
In one possible implementation, the second actuation element comprises a fourth electrode layer and a fifth electrode layer, the phase change element is a layered structure, and the second superlens unit further comprises a substrate and at least one second nanostructure;
the second nanostructure and the fourth electrode layer are arranged on the same side of the substrate, and the fourth electrode layer is filled around the second nanostructure; the height of the fourth electrode layer is less than the height of the second nanostructure;
the phase change element is positioned on one side of the fourth electrode layer, which is far away from the substrate, and is filled around the second nanostructure; the sum of the heights of the fourth electrode layer and the phase change element is greater than the height of the second nanostructure;
the fifth electrode layer is positioned on one side, far away from the fourth electrode layer, of the phase change element; the fourth electrode layer and the fifth electrode layer are used to apply a third voltage to the phase change element.
In one possible implementation, the second superlens array is located between the secondary display screen and the first superlens array; or alternatively
The second superlens array is located between the first superlens array and the projection lens.
In one possible implementation, the first superlens unit and the second superlens unit are both chromatic aberration correction superlenses.
In one possible implementation, the auxiliary display screen is located outside a field of view corresponding to an object field angle of the projection lens.
In one possible implementation, the size of the secondary display is smaller than the size of the primary display.
In one possible implementation, the projection lens is a superlens.
In one possible implementation, the projection lens is a chromatic aberration correcting superlens.
In one possible implementation, the projection lens is a superlens with adjustable focal length.
The embodiment of the utility model provides an in the scheme set up the main display screen of low resolution ratio and the supplementary display screen of high resolution ratio respectively in first super lens array both sides, and first super lens unit is the transmission-type in the first super lens array, the first super lens unit of part is the reflection-type, thereby can with the main display screen with assist the formation of image light that the display screen sent to go out to projection lens in the lump, form part high resolution ratio, the integration image of part low resolution ratio, utilize the less characteristics of people's eye sight focus, can form the image of high resolution ratio in focus department of people's eye, thereby can present high-quality image to the user. The virtual reality display device can be provided with a large-size main screen to realize a large field angle; the auxiliary display screen with high resolution is utilized, high-resolution display can be realized without setting the main display screen as a high-resolution screen, and the energy consumption is low; and, first super lens array is based on super surface technology and realizes, and it has frivolous characteristics, can reduce virtual reality display device's volume and weight, conveniently realizes the lightweight.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a first structural schematic diagram of a virtual reality display device provided by an embodiment of the present invention;
fig. 2 shows a second schematic structural diagram of the virtual reality display device provided in the embodiment of the present invention;
fig. 3A is a schematic structural diagram illustrating a transmission light of a first superlens unit according to an embodiment of the present invention;
fig. 3B is a schematic structural diagram illustrating a reflected light of the first superlens unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first superlens unit provided in an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a third structure of a virtual reality display apparatus according to an embodiment of the present invention;
fig. 6 shows a fourth schematic structural diagram of a virtual reality display device according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating a second superlens unit provided in an embodiment of the present invention;
fig. 8 shows a fifth schematic structural diagram of the virtual reality display device according to an embodiment of the present invention.
An icon:
10-main display screen, 20-auxiliary display screen, 30-first super lens array, 40-projection lens, 50-second super lens array, 60-eyeball tracking system;
31-first superlens unit, 301-first electrode layer, 302-second electrode layer, 303-third electrode layer, 304-heating resistor, 305-vanadium oxide layer, 306-first nanostructure, 307-substrate;
51-second superlens unit, 501-substrate, 502-second nanostructure, 503-phase change element, 504-fourth electrode layer, 505-fifth electrode layer.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
An embodiment of the utility model provides a virtual reality display device, it can be applied to in Virtual Reality (VR) scene. Referring to fig. 1, the virtual reality display apparatus includes: a main display screen 10, an auxiliary display screen 20, a first superlens array 30, and a projection lens 40; the first superlens array 30 includes a plurality of first superlens units 31 arranged in an array, and the resolution of the secondary display screen 20 is greater than that of the primary display screen 10.
The first super lens array 30 is located on the light-emitting side of the main display 10 and located between the main display 10 and the projection lens 40; a part of the first superlens units 31 in the first superlens array 30 can transmit light, and another part of the first superlens units 31 can reflect light. The main display 10 is used for emitting a first imaging light; the first superlens unit 31 capable of transmitting light is used to transmit the first imaging light to the projection lens 40. The auxiliary display screen 20 is positioned at one side of the first superlens array 30 close to the projection lens 40, and emits second imaging light; the first superlens unit 31 capable of reflecting light rays is used to reflect the second imaged light rays to the projection lens 40. The projection lens 40 is used to converge the first and second imaging light rays to generate a fused image.
In the embodiment of the present invention, as shown in fig. 1, the main display screen 10 emits the first imaging light to the left, the left side of the main display screen is the light emitting side, and the first super-lens array 30 is located on the left side of the main display screen 10. The first superlens array 30 includes a plurality of first superlens units 31 arranged in an array, in which a part of the first superlens units 31 can transmit light, and another part of the first superlens units 31 can reflect light. The first imaging light reaches the light-transmissive first superlens unit 31, and then may pass through the first superlens unit 31. Also, the sub display 20 can emit a second image light, which is incident to the first superlens unit 31 capable of reflecting, and then can be reflected by the first superlens unit 31. Wherein, the first imaging light transmitted by the first superlens unit 31 capable of transmitting light and the second imaging light reflected by the first superlens unit 31 capable of reflecting light have substantially the same propagation direction, and both are directed to the projection lens 40; as shown in fig. 1, both imaging light rays are transmitted to the left to be incident on the projection lens 40, and the main display screen 10 and the sub display screen 20 are spliced to form a complete image. For example, the second imaging light rays reflected by the first superlens unit 31, which can reflect light rays, coincide with the traveling direction of the first imaging light rays transmitted by the first superlens unit 31 when light rays can be transmitted.
In the embodiment of the present invention, after the first imaging light emitted from the main display 10 is emitted to the first super lens unit 31 capable of reflecting light, the first imaging light is not emitted to the projection lens 40, for example, the first imaging light is reflected to other positions by the first super lens unit 31; the light reflected to the projection lens 40 by the first superlens unit 31 capable of reflecting the light is the second imaging light emitted from the auxiliary display 20. The light emitted from the first superlens array 30 to the projection lens 40 includes a first imaging light and a second imaging light, and the two imaging lights respectively correspond to different positions of the first superlens array 30, so that the two imaging lights can form a fused image, where the fused image includes an image displayed on the main display screen 10 and an image displayed on the auxiliary display screen 20. The fused image is visible to an observer looking toward the first superlens array 30. As shown in fig. 1, the first superlens unit 31 capable of reflecting light is located in the middle of the first superlens array 30, and the image fusion is implemented by the image displayed on the auxiliary display 20 in the middle of the fused image and the image displayed on the main display 10 in the periphery of the fused image.
In the embodiment of the present invention, the resolution of the auxiliary display screen 20 is greater than the resolution of the main display screen 10, so that part of the fused image is high-resolution, and the other regions are low-resolution; when the human eyes watch the fused image, the sight focus of the human eyes is very small, so that the high-resolution image can be arranged at the sight focus of the human eyes, and the high-resolution image can be displayed at the sight focus of the human eyes. For example, the first superlens unit 31, which can set the high-resolution image at the middle position of the fused image, i.e., the middle position of the first superlens array 30, can reflect light, so that the second imaging light with high resolution can be reflected to the projection lens 40, thereby allowing the human eye to view the high-resolution image. Also, the size of the sub display 20 is generally smaller than that of the main display 10. Alternatively, in order to avoid the secondary display 20 from blocking the imaging effect of the main display 10, the secondary display 20 is located outside the field of view corresponding to the object field angle of the projection lens 40.
The projection lens 40 can be a conventional refractive lens, or as shown in fig. 1, the projection lens 40 can also be a super lens, so that the virtual reality display device is lighter and thinner. The imaging light (including the first imaging light and the second imaging light) passes through the projection lens 40 and reaches a viewing position, such as a position of human eyes, so that the human eyes can view images formed by the main display screen 10 and the auxiliary display screen 20, i.e., a fused image. Wherein the projection lens 40 can perform a magnifying function. For example, the main screen 10 is located within one focal length of the projection lens 40 so that an enlarged virtual image of the main screen 10 can be viewed at human eyes.
The embodiment of the utility model provides a virtual reality display device, set up the main display screen 10 of low resolution and the supplementary display screen 20 of high resolution respectively at first super lens array 30 both sides, and first super lens unit 31 of part is the transmissive in first super lens array 30, the first super lens unit 31 of part is reflective, thereby can be with the imaging light that main display screen 10 and supplementary display screen 20 sent to emergent to projection lens 40 in the lump, form part high resolution, the integration image of part low resolution, utilize the less characteristics of people's eye sight focus, can form the image of high resolution in the sight focus department of people's eye, thereby can present high-quality image to the user. The virtual reality display device can be provided with a large-size main screen 10, and a large field angle is realized; by using the auxiliary display screen 20 with high resolution, high-resolution display can be realized without setting the main display screen 10 as a high-resolution screen, and the energy consumption is low; moreover, the first super lens array 30 is realized based on a super surface technology, and has the characteristics of lightness and thinness, so that the volume and weight of the virtual reality display device can be reduced, and the light weight is conveniently realized.
Optionally, the first superlens unit 31 in the first superlens array 30 is a transflective adjustable superlens, i.e. the first superlens unit 31 can be switched between a transmissive state and a reflective state, so as to adjust which regions of the first superlens array 30 are used for transmitting light rays, e.g. transmitting first imaging light rays, and which regions are used for reflecting light rays, e.g. reflecting second imaging light rays. Further, which partial region in the fused image is high-resolution can be adjusted. Optionally, referring to fig. 2, the virtual reality display apparatus further includes: an eye tracking system 60; the eye tracking system 60 is located to the side of the projection lens 40 and is directed towards the exit pupil of the projection lens 40. The embodiment of the utility model provides an in, the exit pupil position of projection lens 40 generally is the position of people's eye, this eyeball tracking system 60 is towards the exit pupil position of projection lens 40, can catch the change of user's eyeball, thereby can fix a position the focus of people's eye sight, later change the first state of passing through super lens unit 31 of corresponding position department in the first super lens array 30, thereby can make second imaging light be reflected to the focus of people's eye sight, make the image of people's eye sight focus department be the image of high resolution all the time. The eye tracking system 60 is well known in the art for capturing and positioning eyes, and will not be described in detail herein.
The embodiment of the utility model provides an in, can utilize the characteristics that vanadium oxide can reflect light or transmission light under different phase transition states, realize that the transflective of first super lens unit 31 is adjustable. Referring to fig. 3A and 3B, the first superlens unit 31 includes: a first excitation element and vanadium oxide layer 305; the first excitation element is for applying a first excitation to the vanadium oxide layer 305; the vanadium oxide layer 305 is capable of changing phase change state under the action of the first stimulus to cause the first superlens unit 31 to switch between being capable of transmitting light and being capable of reflecting light.
In the embodiment of the present invention, under the effect of the first excitation applied by the first excitation element, the phase change state of the vanadium oxide layer 305 can be changed. Typically, the first excitation is a temperature-dependent excitation, and the vanadium oxide layer 305 may exhibit different phase-change states at different temperatures, for example, may exhibit a conductive state and a semiconductor state. In the case where the vanadium oxide layer 305 is in a semiconductor state, the vanadium oxide layer 305 can transmit light, so that the first superlens unit 31 is transmissive, which is in a transmissive state, as shown in fig. 3A; in the case where the vanadium oxide layer 305 is in a conductive state, the vanadium oxide layer 305 can reflect light, so that the first superlens unit 31 is reflective, which is in a reflective state, as shown in fig. 3B. By controlling the first excitation applied by the first excitation element, the transflective tunability of the first superlens unit 31 is achieved.
Alternatively, the first excitation element may change the temperature of the vanadium oxide layer 305 by means of voltage heating resistors, as shown in fig. 3A and 3B, and includes: a first electrode layer 301, a second electrode layer 302, and a heating resistor 304; the first superlens unit 31 further includes: at least one first nanostructure 306.
As shown, the heating resistor 304 is located between the first electrode layer 301 and the second electrode layer 302, and abuts against the first electrode layer 301 and the second electrode layer 302; the first electrode layer 301 and the second electrode layer 302 are used for applying a first voltage to the heating resistor 304, and the heating resistor 304 is used for changing the temperature of the vanadium oxide layer 305 under the action of the first voltage; the first nanostructures 306 are located on a side of the second electrode layer 302 remote from the first electrode layer 301.
In the embodiment of the present invention, the first electrode layer 301 and the second electrode layer 302 can apply a first voltage to the heating resistor 304, so as to heat the heating resistor 304, and further change the temperature of the vanadium oxide layer 305; as shown in FIGS. 3A and 3B, the potentials of the first electrode layer 301 and the second electrode layer 302 are V, respectively 1 And V 2 The voltage difference between the two is the first voltage applied to the heating resistor 304. To facilitate heat conduction, the vanadium oxide layer 305 is in contact with the heating resistor 304. Fig. 3A and 3B are cross-sectional views of the first superlens unit 31, and heating resistors 304 may be disposed at both sides of the vanadium oxide layer 305; alternatively, the heating resistor 304 may have a ring-shaped structure, and the vanadium oxide layer 305 is located in the middle of the heating resistor 304, but the shape of the heating resistor 304 is not limited in this embodiment. The first electrode layer 301 and the second electrode layer 302 are transparent in an operating band, and the operating band may specifically include a visible light band.
And, the first nanostructure 306 of the first superlens unit 31 is on the second electrode layer 302 and on a side thereof away from the first electrode layer 301. The first nanostructure 306 may modulate incident light. The nanostructure (such as the first nanostructure 306, or the second nanostructure 502 described below) is an all-dielectric structural unit, which may be a cylinder, a square column, or the like, and the implementation of phase modulation using the nanostructure is a mature technology in the super-surface technology, and will not be described in detail here.
The embodiment of the utility model provides an in, through controlling the voltage on first electrode layer 301, the second electrode layer 302, can realize controlling the temperature on vanadium oxide layer 305, and then adjust this vanadium oxide layer 305's phase transition state, realize that first super lens unit 31's transparency is adjustable. The control mode does not need a complex structure and is simple and convenient to realize.
Further optionally, the first nanostructure 306 is made of a phase change material. The first excitation element is also used to apply a second excitation to the first nanostructure 306; the first nanostructure 306 is capable of changing phase change state under the action of the second stimulus, such that the first superlens unit 31 changes the modulation effect on the incident light.
In the embodiment of the present invention, the first nanostructure 306 itself is also adjustable, and the phase change material is utilized to change the phase change state thereof under the excitation, so that the phase change state of the first nanostructure 306 can be changed under the second excitation effect exerted by the first excitation element, and the modulation of the first superlens unit 31 can be changedAnd (5) preparing an effect. For example, the second imaged light reflected by the first superlens unit 31 capable of reflecting light is made to substantially coincide with the direction of the transmitted first imaged light to achieve image fusion. The phase-change material is a material capable of realizing crystalline state and amorphous state conversion; for example, the phase change material may be germanium antimony telluride (Ge) X SB Y TE Z ) Germanium telluride (Ge) X TE Y ) Antimony telluride (Sb) X TE Y ) Silver antimony telluride (Ag) X SB Y TE Z ) And the like. For example, the phase change material is GST (Ge) 2 SB 2 TE 5 ) By applying voltage and the like, the crystalline state of the phase-change material can be realized
Fast conversion of the amorphous state; also, partial crystallization may be achieved such that the phase change material is in one state between the crystalline and amorphous states.
Optionally, referring to fig. 4, the first excitation element further comprises: a third electrode layer 303. The first nanostructure 306 is located between the second electrode layer 302 and the third electrode layer 303 and abuts the second electrode layer 302 and the third electrode layer 303; the second electrode layer 302 and the third electrode layer 303 are used to apply a second voltage to the first nanostructures 306. Optionally, the first superlens unit 31 may further include a substrate 307 for supporting, and the substrate 307 and the third electrode layer 303 are transparent in the operating wavelength band.
The embodiment of the utility model provides an in, utilize phase change material can electrically conductive characteristics, set up second electrode layer 302 and third electrode layer 303 at first nanostructure 306 both ends to can apply voltage to this first nanostructure 306, and then change the phase transition state of the first nanostructure 306 of this phase change material preparation, thereby change the modulation effect of this first superlens unit 31, change the direction etc. of first superlens unit 31 outgoing light for example. As shown in FIG. 4, the potentials of the second electrode layer 302 and the third electrode layer 303 are V, respectively 2 And V 3 The voltage difference between the two is the second voltage applied to the first nanostructure 306.
Alternatively, the present embodiment utilizes the second superlens array 50 to adjust the direction of the second imaging light to reflect the second imaging light to different positions, so as to display high-resolution images at different positions of the fused image; for example, the position to which the second imaging light is reflected is adjusted according to the position at which the human eye sight is focused, so that the human eye sight focus is always positioned in the high-resolution area. Referring to fig. 5, the virtual reality display apparatus further includes: a second superlens array 50; the second superlens array 50 includes a plurality of second superlens units 51 arranged in an array; the second superlens unit 51 is a tunable superlens. The second superlens array 50 is used for modulating the second imaging light before the second imaging light is emitted to the projection lens 40, so as to adjust the direction of the second imaging light.
The embodiment of the present invention provides an embodiment, the second super lens array 50 is arranged in the propagation path of the second imaging light, and the second super lens unit 51 therein is an adjustable super lens, so as to control the modulation effect of the second imaging light incident to the second super lens unit 51, and further control the emitting direction of the second imaging light. As shown in fig. 5, the second superlens array 50 is located between the first superlens array 30 and the projection lens 40; alternatively, as shown in fig. 6, the second superlens array 50 is positioned between the sub-display 20 and the first superlens array 30. The embodiment of the utility model provides an in, utilize the super lens unit 51 of phase place adjustable second, can adjust the direction of second formation of image light for when needs project second formation of image light to different positions, this second formation of image light is unanimous basically with the direction of first formation of image light, thereby can form the better fusion image of effect. In the case where the second superlens array 50 is located between the auxiliary display 20 and the first superlens array 30, the second superlens array 50 may be disposed in parallel with the auxiliary display 20, which may simplify the design of the second superlens array 50.
Alternatively, the second superlens unit 51 includes: a second actuating element and a phase change element 503 made of a phase change material; the second actuating element is used to apply a third actuation to phase change element 503; the phase change element 503 is able to change phase change state upon a third actuation to cause the second superlens cell 51 to change the modulation effect on the incident light. In the embodiment of the present invention, similar to the first nanostructure 306, the second superlens unit 51 includes the phase change element 503 made of the phase change material, and the phase change state of the phase change element 503 is changed by the third excitation, so as to realize the phase adjustability of the second superlens unit 51.
In particular, referring to fig. 7, the second actuation element comprises a fourth electrode layer 504 and a fifth electrode layer 505, the phase change element 503 is a layered structure, and the second superlens unit 51 further comprises a substrate 501 and at least one second nanostructure 502.
Wherein, the second nanostructure 502 and the fourth electrode layer 504 are both disposed on the same side of the substrate 501, and the fourth electrode layer 504 is filled around the second nanostructure 502; the height of the fourth electrode layer 504 is less than the height of the second nanostructure 502. The phase change element 503 is located on the side of the fourth electrode layer 504 far from the substrate 501, and is filled around the second nanostructure 502; the sum of the heights of the fourth electrode layer 504 and the phase change element 503 is greater than the height of the second nanostructure 502. The fifth electrode layer 505 is located on the side of the phase change element 503 away from the fourth electrode layer 504; the fourth electrode layer 504 and the fifth electrode layer 505 are used to apply a third voltage to the phase change element 503.
In the embodiment of the present invention, the substrate 501 and the second nano-structure 502 arranged on one side thereof form a basic super-surface, and the fourth electrode layer 504 and the fifth electrode layer 505 are disposed on two sides of the phase change element 503, and different voltages are applied to the fourth electrode layer 504 and the fifth electrode layer 505 to form a voltage difference, so that an electric excitation can be applied to the phase change element 503 made of the phase change material, and the phase change state of the phase change element 503 can be changed. The fourth electrode layer 504 and the phase change element 503 are both filled around the second nanostructure 502, and the equivalent refractive index at the position of the second nanostructure 502 can be changed by changing the phase change state of the phase change element 503, so as to change the phase modulation effect of the second superlens unit 51. The sum of the heights of the fourth electrode layer 504 and the phase change element 503 is greater than the height of the second nanostructure 502, so that the fifth electrode layer 505 is spaced from the second nanostructure 502 by a certain distance, which can prevent the second nanostructure 502 from contacting the fifth electrode layer 505 and avoid the electrical leakage of the second nanostructure 502.
As shown in FIG. 7, the second imaged light ray is at an angle θ i The second image light can be incident on the second super lens unit 51 at different angles of emergence theta under different electric excitations o And (7) emitting. As shown in FIG. 7, the third voltage applied to phase change element 503 is Δ V 31 Or Δ V 32 When the light source is used, different modulation effects can be achieved, and therefore the emergent direction of the second imaging light can be changed.
Further alternatively, the electrode layers (the fourth electrode layer 504 and the fifth electrode layer 505) apply different voltages to the phase change element 503, and the focal length of the second superlens unit 51 can also be changed, i.e., the third excitation can also adjust the focal length of the second superlens unit 51. By adjusting the focal lengths of the different second superlens units 51 so that the focal lengths of the second superlens units 51 at different positions may be different, so that an image of high resolution can be modulated to have different focal lengths (depths), focus conflict (VAC) can be alleviated.
The embodiment of the present invention provides an embodiment, this super lens unit 51 of second can be compound super lens, and it can realize adjusting the emergent direction and the focusing distance of second formation of image light simultaneously, and the phase place that this super lens unit 51 of second was modulated is including adjusting the required phase place of the emergent direction of second formation of image light and the required phase place of focusing distance.
Alternatively, the first and second superlens units 31 and 51 are both chromatic aberration correcting superlenses. For example, the first and second superlens units 31 and 51 may be achromatic in a visible light band, so that chromatic aberration of imaging can be reduced. Further alternatively, the projection lens 40 may also be a chromatic correction superlens to achieve achromatism.
Alternatively, the projection lens 40 may be a superlens with adjustable focal length. By adjusting the focal length of the projection lens 40, the virtual reality display device can be suitable for users with different degrees, and vision correction can be realized. For example, the projection lens 40 has a structure similar to that of the second super lens unit 51 described above, and the focal length of the projection lens 40 is changed by electrical excitation.
In the embodiment of the present invention, the control of the super lens array can be realized by the control unit. For example, referring to fig. 8, the first superlens array 30, the second superlens array 50, and the projection lens 40 are all adjustable superlenses, and the control unit controls the voltage of each adjustable superlens based on the eye focusing position determined by the eye tracking system 60, so that the first imaging light and the second imaging light are incident on the eye in the same direction, and the second imaging light corresponds to the eye focusing position. The control unit can adopt the existing mature technology to realize the required functions, and the working principle of the control unit is not detailed in the embodiment.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the technical solutions of the changes or replacements within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (17)
1. A virtual reality display apparatus, comprising: the display screen comprises a main display screen (10), an auxiliary display screen (20), a first super lens array (30) and a projection lens (40); the first super lens array (30) comprises a plurality of first super lens units (31) arranged in an array, and the resolution of the auxiliary display screen (20) is greater than that of the main display screen (10);
the first super lens array (30) is positioned at the light-emitting side of the main display screen (10) and positioned between the main display screen (10) and the projection lens (40); a part of the first superlens units (31) in the first superlens array (30) can transmit light rays, and the other part of the first superlens units (31) can reflect light rays;
the main display screen (10) is used for emitting first imaging light; a first superlens unit (31) capable of transmitting light rays for transmitting the first imaging light rays to the projection lens (40);
the auxiliary display screen (20) is positioned on one side of the first super lens array (30) close to the projection lens (40) and used for emitting second imaging light rays; a first superlens unit (31) capable of reflecting light rays for reflecting the second imaging light rays to the projection lens (40);
the projection lens (40) is used for converging the first imaging light rays and the second imaging light rays to generate a fused image.
2. The virtual reality display device of claim 1, wherein the first superlens unit (31) comprises: a first excitation element and a vanadium oxide layer (305);
the first excitation element is used for applying a first excitation to the vanadium oxide layer (305); the vanadium oxide layer (305) is capable of changing phase change state under the action of the first stimulus to switch the first superlens unit (31) between being capable of transmitting light and being capable of reflecting light.
3. The virtual reality display device of claim 2, wherein the first actuating element comprises: a first electrode layer (301), a second electrode layer (302), and a heating resistor (304); the first superlens unit (31) further includes: at least one first nanostructure (306);
the heating resistor (304) is located between the first electrode layer (301) and the second electrode layer (302) and abuts against the first electrode layer (301) and the second electrode layer (302); the first electrode layer (301) and the second electrode layer (302) are used for applying a first voltage to the heating resistor (304), and the heating resistor (304) is used for changing the temperature of the vanadium oxide layer (305) under the action of the first voltage;
the first nanostructures (306) are located on a side of the second electrode layer (302) remote from the first electrode layer (301).
4. The virtual reality display device of claim 3, wherein the first nanostructure (306) is made of a phase change material;
the first excitation element is further for applying a second excitation to the first nanostructure (306); the first nanostructure (306) is capable of changing phase change state under the action of the second stimulus, so that the first superlens unit (31) changes the modulation effect on incident light.
5. The virtual reality display device of claim 4, wherein the first actuating element further comprises: a third electrode layer (303);
the first nanostructure (306) is located between the second electrode layer (302) and the third electrode layer (303) and abuts the second electrode layer (302) and the third electrode layer (303); the second electrode layer (302) and the third electrode layer (303) are for applying a second voltage to the first nanostructure (306).
6. The virtual reality display apparatus of claim 2, further comprising: an eye tracking system (60);
the eye tracking system (60) is located to the side of the projection lens (40) and faces the exit pupil position of the projection lens (40).
7. The virtual reality display apparatus of claim 2, further comprising: a second superlens array (50); the second super lens array (50) comprises a plurality of second super lens units (51) arranged in an array; the second superlens unit (51) is an adjustable superlens;
the second superlens array (50) is used for modulating the second imaging light rays before the second imaging light rays are emitted to the projection lens (40) so as to adjust the direction of the second imaging light rays.
8. The virtual reality display device of claim 7, wherein the second superlens unit (51) comprises: a second actuation element and a phase change element (503) made of a phase change material;
the second actuation element is to apply a third actuation to the phase change element (503); the phase change element (503) is capable of changing phase change state under the action of the third stimulus, so that the second superlens unit (51) changes the modulation effect on incident light rays.
9. The virtual reality display device of claim 8, wherein the third stimulus is also used to adjust a focal length of the second superlens unit (51).
10. The virtual reality display device of claim 8, wherein the second actuating element comprises a fourth electrode layer (504) and a fifth electrode layer (505), the phase change element (503) is a layered structure, and the second superlens cell (51) further comprises a substrate (501) and at least one second nanostructure (502);
the second nanostructure (502) and the fourth electrode layer (504) are arranged on the same side of the substrate (501), and the fourth electrode layer (504) is filled around the second nanostructure (502); the height of the fourth electrode layer (504) is less than the height of the second nanostructure (502);
the phase change element (503) is positioned on one side of the fourth electrode layer (504) far away from the substrate (501) and is filled around the second nanostructure (502); the sum of the heights of the fourth electrode layer (504) and the phase change element (503) is greater than the height of the second nanostructure (502);
the fifth electrode layer (505) is located on a side of the phase change element (503) away from the fourth electrode layer (504); the fourth electrode layer (504) and the fifth electrode layer (505) are used to apply a third voltage to the phase change element (503).
11. The virtual reality display apparatus of claim 7,
the second superlens array (50) is located between the secondary display screen (20) and the first superlens array (30); or
The second superlens array (50) is located between the first superlens array (30) and the projection lens (40).
12. The virtual reality display device of claim 7, wherein the first superlens unit (31) and the second superlens unit (51) are both chromatic aberration correcting superlenses.
13. The virtual reality display apparatus of claim 1, wherein the secondary display screen (20) is positioned outside a field of view corresponding to an object field angle of the projection lens (40).
14. The virtual reality display apparatus of claim 1, wherein the secondary display (20) is smaller in size than the primary display (10).
15. The virtual reality display device of claim 1, wherein the projection lens (40) is a superlens.
16. The virtual reality display device of claim 15, wherein the projection lens (40) is a chromatic aberration correcting superlens.
17. The virtual reality display device of claim 16, wherein the projection lens (40) is a superlens with adjustable focal length.
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| CN116047768A (en) * | 2022-12-30 | 2023-05-02 | 歌尔科技有限公司 | Display device and virtual reality display device |
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